Populations of Cladocera and Copepoda have been studied in three fishponds of which one was refilled with water after one year of culture whilst empty. The physical-chemical characteristics of the biotope varied with a marked regularity which was a function of climatic factors. Several associations of Cladocera and Copepoda succeeded one another during an annual period after filling with water. The ageing of the pond with reference to its last dry period was shown by a modification of the structure of the crustacean population. Certain species consumed by the carp had a benthic ecophase which enabled them to resist the drainage, the labouring and the cultivation of the soil of the pond; this ensured a rapid repopulation of the pond when it was refilled.

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